The support document was also more ambiguous about the synchronization speed than was Mac OS X 10.5.6's accompanying description. The former, for example, said, "...generally within a minute of the change being made on the computer, another device, or on the web at me.com." The latter omitted the word "generally."

Mac OS X 10.5.6 also includes 37 other improvements and fixes for applications ranging from the Address Book to Mail, and for features such as the operating system's wireless, networking, printing, parental controls and automatic backup.

Among the networking changes were performance improvements to Apple File Sharing, reliability fixes for TCP connections, and both performance and reliability enhancements for AT&T Inc.-branded 3G wireless cards. Apple said it had fixed bugs in Time Machine, Leopard's integrated backup and restore application, when used with Apple's Time Capsule storage device, and in Safari.

Apple last updated Leopard in . MobileMe was also one of the target applications then, too, as it was in late October when Apple revealed it had made to the sync service in a separate, behind-the-scenes update to its servers.

Mac OS X 10.5.6 can be downloaded manually from the Apple site or installed using Mac OS X's integrated update service. Also included in the upgrade are patches for 21 security vulnerabilities that address bugs in Flash Player, the operating system's kernel and its CoreTypes component.